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CSHATAG(1) User Manuals CSHATAG(1) NAME cshatag - shatag in C SYNOPSIS cshatag FILE DESCRIPTION cshatag is a minimal re-implementation in C of shatag ( https://bitbucket.org/maugier/shatag , written in python by Maxime Augier ). cshatag is a tool to detect silent data corruption. It writes the mtime and the sha256 checksum of a file into the file's extended attributes. The filesystem needs to be mounted with user_xattr enabled for this to work. When run again, it compares stored mtime and checksum. If it finds that the mtime is unchanged but the checksum has changed, it warns on stderr. In any case, the status of the file is printed to stdout and the stored checksum is updated. File statuses that appear on stdout are: outdated mtime has changed ok mtime has not changed, checksum is correct corrupt mtime has not changed, checksum is wrong cshatag aims to be format-compatible with shatag and uses the same extended attributes (see the COMPATIBILITY section). EXAMPLES Typically, cshatag will be called from find: # find / -xdev -type f -exec cshatag {} \; > cshatag.log Errors like corrupt files will then be printed to stderr or grep for "corrupt" in cshatag.log. To remove the extended attributes from all files: # find / -xdev -type f -exec setfattr -x user.shatag.ts {} \; -exec setfattr -x user.shatag.sha256 {} ; RETURN VALUE 0 Success 1 Wrong number of arguments 2 File could not be opened 3 File is not a regular file 4 Extended attributs could not be written to file 5 File is corrupt COMPATIBILITY cshatag writes the user.shatag.ts field with full integer nanosecond precision, while python uses a double for the whole mtime and loses the last few digits. AUTHOR Jakob Unterwurzacher <jakobunt@gmail.com> COPYRIGHT Copyright 2012 Jakob Unterwurzacher. License GPLv2+. SEE ALSO shatag(1), sha256sum(1), getfattr(1), setfattr(1) Linux MAY 2012 CSHATAG(1)
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Detect silent data corruption under Linux using checksums in extended attributes
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